Definitely seems like the staff is banking a lot on development and the new coaches unlocking another level for some guys, which is a gamble. I think Stoudmire will at least be an improvement over Jeudy, and everyone else is a year older. I'm clearly gullible, but I am willing to believe a defensive staff with a coherent plan can make significant improvements with the same pieces (+ a year of experience for each of them). DL is not going to be a strength though.
Pass rush has a little more reason for optimism IMO, Nwaneri and Pietrzak both flashed as freshmen. Nwaneri just needs to finish - similar to Princewill a year ago, his pressure rate didn't translate to as many actual sacks as you'd expect. But it's also a gamble to bet on young guys without a ton of production and only bring in one guy who has more schools played for than sacks.